<template>
    <header class="navbar">
        <SidebarButton @toggle-sidebar="$emit('toggle-sidebar')" />

        <RouterLink :to="$localePath" class="home-link">
            <img
                v-if="$site.themeConfig.logo"
                class="logo"
                :src="$withBase($site.themeConfig.logo)"
                :alt="$siteTitle"
            />
            <span
                v-if="$siteTitle"
                ref="siteName"
                class="site-name"
                :class="{ 'can-hide': $site.themeConfig.logo }"
                >{{ $siteTitle }}</span
            >
        </RouterLink>

        <div
            class="links"
            :style="
                linksWrapMaxWidth
                    ? {
                          'max-width': linksWrapMaxWidth + 'px',
                      }
                    : {}
            "
        >
            <AlgoliaSearchBox v-if="isAlgoliaSearch" :options="algolia" />
            <SearchBox
                v-else-if="
                    $site.themeConfig.search !== false &&
                    $page.frontmatter.search !== false
                "
            />
            <NavLinks class="can-hide" />
        </div>
    </header>
</template>

<script>
import AlgoliaSearchBox from '@AlgoliaSearchBox'
import SearchBox from '@SearchBox'
import SidebarButton from '@theme/components/SidebarButton.vue'
import NavLinks from '@theme/components/NavLinks.vue'

export default {
    name: 'Navbar',

    components: {
        SidebarButton,
        NavLinks,
        SearchBox,
        AlgoliaSearchBox,
    },

    data() {
        return {
            linksWrapMaxWidth: null,
        }
    },

    computed: {
        algolia() {
            return (
                this.$themeLocaleConfig.algolia ||
                this.$site.themeConfig.algolia ||
                {}
            )
        },

        isAlgoliaSearch() {
            return this.algolia && this.algolia.apiKey && this.algolia.indexName
        },
    },

    mounted() {
        const MOBILE_DESKTOP_BREAKPOINT = 719 // refer to config.styl
        const NAVBAR_VERTICAL_PADDING =
            parseInt(css(this.$el, 'paddingLeft')) +
            parseInt(css(this.$el, 'paddingRight'))
        const handleLinksWrapWidth = () => {
            if (
                document.documentElement.clientWidth < MOBILE_DESKTOP_BREAKPOINT
            ) {
                this.linksWrapMaxWidth = null
            } else {
                this.linksWrapMaxWidth =
                    this.$el.offsetWidth -
                    NAVBAR_VERTICAL_PADDING -
                    ((this.$refs.siteName && this.$refs.siteName.offsetWidth) ||
                        0)
            }
        }
        handleLinksWrapWidth()
        window.addEventListener('resize', handleLinksWrapWidth, false)
    },
}

function css(el, property) {
    // NOTE: Known bug, will return 'auto' if style value is 'auto'
    const win = el.ownerDocument.defaultView
    // null means not to return pseudo styles
    return win.getComputedStyle(el, null)[property]
}
</script>

<style lang="stylus">
$navbar-vertical-padding = 0.7rem
$navbar-horizontal-padding = 1.5rem

.navbar
  padding $navbar-vertical-padding $navbar-horizontal-padding
  line-height $navbarHeight - 1.4rem
  a, span, img
    display inline-block
  .logo
    height $navbarHeight - 1.4rem
    min-width $navbarHeight - 1.4rem
    margin-right 0.8rem
    vertical-align top
  .site-name
    font-size 1.3rem
    font-weight 600
    color #fff
    position relative
  .links
    padding-left 1.5rem
    box-sizing border-box
    // background-color white
    white-space nowrap
    font-size 0.9rem
    position absolute
    right $navbar-horizontal-padding
    top $navbar-vertical-padding
    display flex
    .search-box
      flex: 0 0 auto
      vertical-align top

@media (max-width: $MQMobile)
  .navbar
    padding-left 4rem
    .can-hide
      display none
    .links
      padding-left 1.5rem
    .site-name
      width calc(100vw - 9.4rem)
      overflow hidden
      white-space nowrap
      text-overflow ellipsis
</style>
